recommendation
I like what you've done so please take the following as constructive criticism.
Walter Korff,the father of grille blocking,had specific recommendations for cooling system inlets.
If he were to view your project I believe he would suggest that you close off the entire upper grille portion,lower your license plate,then open a single,full-width slot,the width of the radiator where the top of the license plate is now.
The stagnation pressure is highest there and your opening needs to be at least as wide as the radiator unless you extend the nose forward more than a foot to allow for an airtight divergent inlet duct.
As temps warm in the spring additional slot area can be opened if necessary.
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